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Gloveli N, Simonnet J, Tang W, Concha-Miranda M, Maier E, Dvorzhak A, Schmitz D, Brecht M. Play and tickling responses map to the lateral columns of the rat periaqueductal gray. Neuron 2023; 111:3041-3052.e7. [PMID: 37516112 PMCID: PMC10552647 DOI: 10.1016/j.neuron.2023.06.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 05/16/2023] [Accepted: 06/22/2023] [Indexed: 07/31/2023]
Abstract
The persistence of play after decortication points to a subcortical mechanism of play control. We found that global blockade of the rat periaqueductal gray with either muscimol or lidocaine interfered with ticklishness and play. We recorded vocalizations and neural activity from the periaqueductal gray of young, playful rats during interspecific touch, play, and tickling. Rats vocalized weakly to touch and more strongly to play and tickling. Periaqueductal gray units showed diverse but strong modulation to tickling and play. Hierarchical clustering based on neuronal responses to play and tickling revealed functional clusters mapping to different periaqueductal gray columns. Specifically, we observed play-neutral/tickling-inhibited and tickling/play-neutral units in dorsolateral and dorsomedial periaqueductal gray columns. In contrast, strongly play/tickling-excited units mapped to the lateral columns and were suppressed by anxiogenic conditions. Optogenetic inactivation of lateral periaqueductal columns disrupted ticklishness and play. We conclude that the lateral periaqueductal gray columns are decisive for play and laughter.
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Affiliation(s)
- Natalie Gloveli
- Bernstein Center for Computational Neuroscience Berlin, Humboldt-Universität zu Berlin, Philippstr. 13, Haus 6, 10115 Berlin, Germany; Charité-Universitätsmedizin Berlin, Einstein Center for Neurosciences, Berlin, 10117 Berlin, Germany
| | - Jean Simonnet
- Bernstein Center for Computational Neuroscience Berlin, Humboldt-Universität zu Berlin, Philippstr. 13, Haus 6, 10115 Berlin, Germany
| | - Wei Tang
- Bernstein Center for Computational Neuroscience Berlin, Humboldt-Universität zu Berlin, Philippstr. 13, Haus 6, 10115 Berlin, Germany
| | - Miguel Concha-Miranda
- Bernstein Center for Computational Neuroscience Berlin, Humboldt-Universität zu Berlin, Philippstr. 13, Haus 6, 10115 Berlin, Germany
| | - Eduard Maier
- Bernstein Center for Computational Neuroscience Berlin, Humboldt-Universität zu Berlin, Philippstr. 13, Haus 6, 10115 Berlin, Germany; Department of Neuropeptide Research in Psychiatry, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Anton Dvorzhak
- Charité-Universitätsmedizin Berlin, Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Neuroscience Research Center, 10117 Berlin, Germany
| | - Dietmar Schmitz
- Bernstein Center for Computational Neuroscience Berlin, Humboldt-Universität zu Berlin, Philippstr. 13, Haus 6, 10115 Berlin, Germany; NeuroCure Cluster of Excellence, Humboldt-Universität zu Berlin, Berlin, Germany; Charité-Universitätsmedizin Berlin, Einstein Center for Neurosciences, Berlin, 10117 Berlin, Germany; Charité-Universitätsmedizin Berlin, Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Neuroscience Research Center, 10117 Berlin, Germany; German Center for Neurodegenerative Diseases (DZNE), 10117 Berlin, Germany
| | - Michael Brecht
- Bernstein Center for Computational Neuroscience Berlin, Humboldt-Universität zu Berlin, Philippstr. 13, Haus 6, 10115 Berlin, Germany; NeuroCure Cluster of Excellence, Humboldt-Universität zu Berlin, Berlin, Germany; Charité-Universitätsmedizin Berlin, Einstein Center for Neurosciences, Berlin, 10117 Berlin, Germany.
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Westermann B, Lotze M, Varra L, Versteeg N, Domin M, Nicolet L, Obrist M, Klepzig K, Marbot L, Lämmler L, Fiedler K, Wattendorf E. When laughter arrests speech: fMRI-based evidence. Philos Trans R Soc Lond B Biol Sci 2022; 377:20210182. [PMID: 36126674 PMCID: PMC9489293 DOI: 10.1098/rstb.2021.0182] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Who has not experienced that sensation of losing the power of speech owing to an involuntary bout of laughter? An investigation of this phenomenon affords an insight into the neuronal processes that underlie laughter. In our functional magnetic resonance imaging study, participants were made to laugh by tickling in a first condition; in a second one they were requested to produce vocal utterances under the provocation of laughter by tickling. This investigation reveals increased neuronal activity in the sensorimotor cortex, the anterior cingulate gyrus, the insula, the nucleus accumbens, the hypothalamus and the periaqueductal grey for both conditions, thereby replicating the results of previous studies on ticklish laughter. However, further analysis indicates the activity in the emotion-associated regions to be lower when tickling is accompanied by voluntary vocalization. Here, a typical pattern of activation is identified, including the primary sensory cortex, a ventral area of the anterior insula and the ventral tegmental field, to which belongs to the nucleus ambiguus, namely, the common effector organ for voluntary and involuntary vocalizations. During the conflictual voluntary-vocalization versus laughter experience, the laughter-triggering network appears to rely heavily on a sensory and a deep interoceptive analysis, as well as on motor effectors in the brainstem. This article is part of the theme issue ‘Cracking the laugh code: laughter through the lens of biology, psychology and neuroscience’.
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Affiliation(s)
- B Westermann
- Department of Neurosurgery, University Hospital Basel, Basel, Switzerland
| | - M Lotze
- Faculty of Medicine, University of Greifswald, Greifswald, Germany
| | - L Varra
- Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland
| | - N Versteeg
- Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland
| | - M Domin
- Faculty of Medicine, University of Greifswald, Greifswald, Germany
| | - L Nicolet
- College of Health Sciences Fribourg, Fribourg, Switzerland
| | - M Obrist
- College of Health Sciences Fribourg, Fribourg, Switzerland
| | - K Klepzig
- College of Health Sciences Fribourg, Fribourg, Switzerland
| | - L Marbot
- Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland
| | - L Lämmler
- Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland
| | - K Fiedler
- Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland
| | - E Wattendorf
- Faculty of Science and Medicine, University of Fribourg, Fribourg, Switzerland.,College of Health Sciences Fribourg, Fribourg, Switzerland
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The PV2 cluster of parvalbumin neurons in the murine periaqueductal gray: connections and gene expression. Brain Struct Funct 2022; 227:2049-2072. [PMID: 35486186 PMCID: PMC9232479 DOI: 10.1007/s00429-022-02491-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 04/03/2022] [Indexed: 12/05/2022]
Abstract
The PV2 (Celio 1990), a cluster of parvalbumin-positive neurons located in the ventromedial region of the distal periaqueductal gray (PAG) has not been previously described as its own entity, leading us to study its extent, connections, and gene expression. It is an oval, bilateral, elongated cluster composed of approximately 475 parvalbumin-expressing neurons in a single mouse hemisphere. In its anterior portion it impinges upon the paratrochlear nucleus (Par4) and in its distal portion it is harbored in the posterodorsal raphe nucleus (PDR). It is known to receive inputs from the orbitofrontal cortex and from the parvafox nucleus in the ventrolateral hypothalamus. Using anterograde tracing methods in parvalbumin-Cre mice, the main projections of the PV2 cluster innervate the supraoculomotor periaqueductal gray (Su3) of the PAG, the parvafox nucleus of the lateral hypothalamus, the gemini nuclei of the posterior hypothalamus, the septal regions, and the diagonal band in the forebrain, as well as various nuclei within the reticular formation in the midbrain and brainstem. Within the brainstem, projections were discrete, but involved areas implicated in autonomic control. The PV2 cluster expressed various peptides and receptors, including the receptor for Adcyap1, a peptide secreted by one of its main afferences, namely, the parvafox nucleus. The expression of GAD1 and GAD2 in the region of the PV2, the presence of Vgat-1 in a subpopulation of PV2-neurons as well as the coexistence of GAD67 immunoreactivity with parvalbumin in terminal endings indicates the inhibitory nature of a subpopulation of PV2-neurons. The PV2 cluster may be part of a feedback controlling the activity of the hypothalamic parvafox and the Su3 nuclei in the periaqueductal gray.
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Glutamatergic fast-spiking parvalbumin neurons in the lateral hypothalamus: Electrophysiological properties to behavior. Physiol Behav 2020; 221:112912. [PMID: 32289319 DOI: 10.1016/j.physbeh.2020.112912] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 02/14/2020] [Accepted: 04/06/2020] [Indexed: 01/10/2023]
Abstract
Throughout the central nervous system, neurons expressing the calcium-binding protein parvalbumin have been typically classified as GABAergic with fast-spiking characteristics. However, new methods that allow systematic characterization of the cytoarchitectural organization, connectivity, activity patterns, neurotransmitter nature, and function of genetically-distinct cell types have revealed populations of parvalbumin-positive neurons that are glutamatergic. Remarkably, such findings challenge longstanding concepts that fast-spiking neurons are exclusively GABAergic, suggesting conservation of the fast-spiking phenotype across at least two neurotransmitter systems. This review focuses on the recent advancements that have begun to reveal the functional roles of lateral hypothalamic parvalbumin-positive neurons in regulating behaviors essential for survival.
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Wattendorf E, Westermann B, Fiedler K, Ritz S, Redmann A, Pfannmöller J, Lotze M, Celio MR. Laughter is in the air: involvement of key nodes of the emotional motor system in the anticipation of tickling. Soc Cogn Affect Neurosci 2020; 14:837-847. [PMID: 31393979 PMCID: PMC6847157 DOI: 10.1093/scan/nsz056] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 06/27/2019] [Accepted: 07/10/2019] [Indexed: 12/22/2022] Open
Abstract
In analogy to the appreciation of humor, that of tickling is based upon the re-interpretation of an anticipated emotional situation. Hence, the anticipation of tickling contributes to the final outburst of ticklish laughter. To localize the neuronal substrates of this process, functional magnetic resonance imaging (fMRI) was conducted on 31 healthy volunteers. The state of anticipation was simulated by generating an uncertainty respecting the onset of manual foot tickling. Anticipation was characterized by an augmented fMRI signal in the anterior insula, the hypothalamus, the nucleus accumbens and the ventral tegmental area, as well as by an attenuated one in the internal globus pallidus. Furthermore, anticipatory activity in the anterior insula correlated positively with the degree of laughter that was produced during tickling. These findings are consistent with an encoding of the expected emotional consequences of tickling and suggest that early regulatory mechanisms influence, automatically, the laughter circuitry at the level of affective and sensory processing. Tickling activated not only those regions of the brain that were involved during anticipation, but also the posterior insula, the anterior cingulate cortex and the periaqueductal gray matter. Sequential or combined anticipatory and tickling-related neuronal activities may adjust emotional and sensorimotor pathways in preparation for the impending laughter response.
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Affiliation(s)
- Elise Wattendorf
- Faculty of Science and Medicine, Department of Neuroscience, Anatomy, University of Fribourg, 1700 Fribourg, Switzerland
| | - Birgit Westermann
- Department of Neurosurgery, University Hospital, University of Basel, 4031 Basel, Switzerland
| | - Klaus Fiedler
- Faculty of Science and Medicine, Department of Neuroscience, Anatomy, University of Fribourg, 1700 Fribourg, Switzerland
| | - Simone Ritz
- Faculty of Science and Medicine, Department of Neuroscience, Anatomy, University of Fribourg, 1700 Fribourg, Switzerland
| | - Annetta Redmann
- Faculty of Science and Medicine, Department of Neuroscience, Anatomy, University of Fribourg, 1700 Fribourg, Switzerland
| | - Jörg Pfannmöller
- Functional Imaging, Center for Diagnostic Radiology and Neuroradiology, University Medicine Greifswald, Walther-Rathenau-Straße 46, 17475 Greifswald, Germany
| | - Martin Lotze
- Functional Imaging, Center for Diagnostic Radiology and Neuroradiology, University Medicine Greifswald, Walther-Rathenau-Straße 46, 17475 Greifswald, Germany
| | - Marco R Celio
- Faculty of Science and Medicine, Department of Neuroscience, Anatomy, University of Fribourg, 1700 Fribourg, Switzerland
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Siemian JN, Borja CB, Sarsfield S, Kisner A, Aponte Y. Lateral hypothalamic fast-spiking parvalbumin neurons modulate nociception through connections in the periaqueductal gray area. Sci Rep 2019; 9:12026. [PMID: 31427712 PMCID: PMC6700312 DOI: 10.1038/s41598-019-48537-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 07/03/2019] [Indexed: 12/21/2022] Open
Abstract
A pivotal role of the lateral hypothalamus (LH) in regulating appetitive and reward-related behaviors has been evident for decades. However, the contributions of LH circuits to other survival behaviors have been less explored. Here we examine how lateral hypothalamic neurons that express the calcium-binding protein parvalbumin (PVALB; LHPV neurons), a small cluster of neurons within the LH glutamatergic circuitry, modulate nociception in mice. We find that photostimulation of LHPV neurons suppresses nociception to an acute, noxious thermal stimulus, whereas photoinhibition potentiates thermal nociception. Moreover, we demonstrate that LHPV axons form functional excitatory synapses on neurons in the ventrolateral periaqueductal gray (vlPAG), and photostimulation of these axons mediates antinociception to both thermal and chemical visceral noxious stimuli. Interestingly, this antinociceptive effect appears to occur independently of opioidergic mechanisms, as antagonism of μ-opioid receptors with systemically-administered naltrexone does not abolish the antinociception evoked by activation of this LHPV→vlPAG pathway. This study directly implicates LHPV neurons in modulating nociception, thus expanding the repertoire of survival behaviors regulated by LH circuits.
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Affiliation(s)
- Justin N Siemian
- Neuronal Circuits and Behavior Unit, National Institute on Drug Abuse Intramural Research Program, National Institutes of Health, Baltimore, MD, 21224-6823, USA
| | - Cara B Borja
- Neuronal Circuits and Behavior Unit, National Institute on Drug Abuse Intramural Research Program, National Institutes of Health, Baltimore, MD, 21224-6823, USA
| | - Sarah Sarsfield
- Neuronal Circuits and Behavior Unit, National Institute on Drug Abuse Intramural Research Program, National Institutes of Health, Baltimore, MD, 21224-6823, USA
| | - Alexandre Kisner
- Neuronal Circuits and Behavior Unit, National Institute on Drug Abuse Intramural Research Program, National Institutes of Health, Baltimore, MD, 21224-6823, USA
| | - Yeka Aponte
- Neuronal Circuits and Behavior Unit, National Institute on Drug Abuse Intramural Research Program, National Institutes of Health, Baltimore, MD, 21224-6823, USA. .,The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
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7
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Rodent ultrasonic vocalizations as biomarkers of future alcohol use: A predictive analytic approach. COGNITIVE AFFECTIVE & BEHAVIORAL NEUROSCIENCE 2019; 18:88-98. [PMID: 29209998 DOI: 10.3758/s13415-017-0554-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Excessive alcohol consumption has a vast, negative impact on society. Rodent models have been successful in furthering our understanding of the biological underpinnings that drive alcohol consumption. Rodents emit ultrasonic vocalizations (USVs) that are each composed of several acoustic characteristics (e.g., frequency, duration, bandwidth, power). USVs reflect neurotransmitter activity in the ascending limb of the mesolimbic dopaminergic and cholinergic neurotransmitter systems and serve as noninvasive, real-time biomarkers of dopaminergic and cholinergic neurotransmission in the limbic system. In the present study, we recorded spontaneously emitted USVs from alcohol-naïve Long-Evans (LE) rats and then measured their alcohol intake. We compared the USV acoustic characteristics and alcohol consumption data from these LE rats with previously published data from selectively bred high-alcohol (P and HAD-1) and low-alcohol (NP and LAD-1) drinking lines from studies with the same experimental method. Predictive analytic techniques were applied simultaneously to this combined data set and revealed that (a) USVs emitted by alcohol-naïve rats accurately discriminated among high-alcohol consuming, LE, and low-alcohol consuming rat lines, and (b) future alcohol consumption in these same rat lines was reliably predicted from the USV data collected in an alcohol-naïve state. To our knowledge, this is the first study to show that alcohol consumption is predicted directly from USV profiles of alcohol-naïve rats. Because USV acoustic characteristics are sensitive to underlying neural activity, these findings suggest that baseline differences in mesolimbic cholinergic and dopaminergic tone could determine the propensity for future alcohol consumption in rodents.
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Roccaro-Waldmeyer DM, Girard F, Milani D, Vannoni E, Prétôt L, Wolfer DP, Celio MR. Eliminating the VGlut2-Dependent Glutamatergic Transmission of Parvalbumin-Expressing Neurons Leads to Deficits in Locomotion and Vocalization, Decreased Pain Sensitivity, and Increased Dominance. Front Behav Neurosci 2018; 12:146. [PMID: 30072881 PMCID: PMC6058961 DOI: 10.3389/fnbeh.2018.00146] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 06/26/2018] [Indexed: 11/13/2022] Open
Abstract
The calcium-binding protein parvalbumin (PV) is a recognized marker of short-axon GABA-ergic neurons in the cortex and the hippocampus. However in addition, PV is expressed by excitatory, glutamatergic neurons in various areas of the brain and spinal cord. Depending on the location of these neurons, loading of their synaptic vesicles with glutamate is mediated by either of three vesicular glutamate transporters (VGlut): VGlut1, VGlut2, or VGlut3. Driven by our interest in one of these glutamatergic/PV-expressing cell clusters-the lateral hypothalamic parvafox nucleus-we investigated the functions of this population of neurons by the selective deletion of VGlut2 expression in PV-expressing cells according to the Cre/Lox-approach. PV-Cre;VGlut2-Lox mutant mice are phenotypically characterized by deficits in locomotion and vocalization, by a decreased thermal nociception, and by an increased social dominance. We conducted a search of the Allen Brain Atlas for regions that might co-express the genes encoding PV and VGlut2, and that might thus contribute to the manifestation of the observed phenotypes. Our survey revealed several structures that could contribute to the deficits in locomotion and vocalization, such as the red, the subthalamic and the deep cerebellar nuclei. It also disclosed that a shift in the balance of afferental glutamatergic neurotransmission to the periaqueductal gray matter might be accountable for the decrease in sensitivity to pain and for the increase in social dominance. As a whole, this study broadens the state of knowledge about PV-expressing excitatory neurons.
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Affiliation(s)
- Diana M Roccaro-Waldmeyer
- Anatomy and Programme in Neuroscience, Department of Medicine, University of Fribourg, Fribourg, Switzerland
| | - Franck Girard
- Anatomy and Programme in Neuroscience, Department of Medicine, University of Fribourg, Fribourg, Switzerland
| | - Daniele Milani
- Anatomy and Programme in Neuroscience, Department of Medicine, University of Fribourg, Fribourg, Switzerland
| | - Elisabetta Vannoni
- Division of Functional Neuroanatomy, Institute of Anatomy, Department of Medicine, University of Zurich, Zurich, Switzerland
| | - Laurent Prétôt
- Anatomy and Programme in Neuroscience, Department of Medicine, University of Fribourg, Fribourg, Switzerland
| | - David P Wolfer
- Division of Functional Neuroanatomy, Institute of Anatomy, Department of Medicine, University of Zurich, Zurich, Switzerland.,Institute of Human Movement Sciences and Sport, Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland
| | - Marco R Celio
- Anatomy and Programme in Neuroscience, Department of Medicine, University of Fribourg, Fribourg, Switzerland
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Mittal N, Thakore N, Bell RL, Maddox WT, Schallert T, Duvauchelle CL. Sex-specific ultrasonic vocalization patterns and alcohol consumption in high alcohol-drinking (HAD-1) rats. Physiol Behav 2017; 203:81-90. [PMID: 29146494 DOI: 10.1016/j.physbeh.2017.11.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 10/03/2017] [Accepted: 11/12/2017] [Indexed: 12/29/2022]
Abstract
Ultrasonic vocalizations (USVs) have been established as an animal model of emotional status and are often utilized in drug abuse studies as motivational and emotional indices. Further USV functionality has been demonstrated in our recent work showing accurate identification of selectively-bred high versus low alcohol-consuming male rats ascertained exclusively from 22 to 28kHz and 50-55kHz FM USV acoustic parameters. With the hypothesis that alcohol-sensitive sex differences could be revealed through USV acoustic parameters, the present study examined USVs and alcohol consumption in male and female selectively bred high-alcohol drinking (HAD-1) rats. For the current study, we examined USV data collected during a 12-week experiment in male and female HAD-1 rats. Experimental phases included Baseline (2weeks), 4-h EtOH Access (4weeks), 24-h EtOH Access (4weeks) and Abstinence (2weeks). Findings showed that both male and female HAD-1 rats spontaneously emitted a large number of 22-28kHz and 50-55kHz FM USVs and that females drank significantly more alcohol compared to males over the entire course of the experiment. Analyses of USV acoustic characteristics (i.e. mean frequency, duration, bandwidth and power) revealed distinct sex-specific phenotypes in both 50-55kHz FM and 22-28kHz USV transmission that were modulated by ethanol exposure. Moreover, by using a linear combination of these acoustic characteristics, we were able to develop binomial logistic regression models able to discriminate between male and female HAD-1 rats with high accuracy. Together these results highlight unique emotional phenotypes in male and female HAD-1 rats that are differentially modulated by alcohol experience.
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Affiliation(s)
- N Mittal
- The University of Texas at Austin, College of Pharmacy, Division of Pharmacology and Toxicology, 2409 University Avenue, Stop A1915, Austin, TX 78712, USA; Waggoner Center for Alcohol and Addiction Research, The University of Texas at Austin, 2500 Speedway, Stop A4800, Austin, TX 78712, USA
| | - N Thakore
- The University of Texas at Austin, College of Pharmacy, Division of Pharmacology and Toxicology, 2409 University Avenue, Stop A1915, Austin, TX 78712, USA; Waggoner Center for Alcohol and Addiction Research, The University of Texas at Austin, 2500 Speedway, Stop A4800, Austin, TX 78712, USA
| | - R L Bell
- Institute of Psychiatric Research, Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - W T Maddox
- Cognitive Design and Statistical Consulting, LLC, Austin, TX 78746, USA
| | - T Schallert
- Waggoner Center for Alcohol and Addiction Research, The University of Texas at Austin, 2500 Speedway, Stop A4800, Austin, TX 78712, USA; The University of Texas at Austin, College of Liberal Arts, Behavioral Neuroscience, 108 E. Dean Keeton, Stop A8000, Austin, TX 78712, USA
| | - C L Duvauchelle
- The University of Texas at Austin, College of Pharmacy, Division of Pharmacology and Toxicology, 2409 University Avenue, Stop A1915, Austin, TX 78712, USA; Waggoner Center for Alcohol and Addiction Research, The University of Texas at Austin, 2500 Speedway, Stop A4800, Austin, TX 78712, USA.
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Panksepp J, Lane RD, Solms M, Smith R. Reconciling cognitive and affective neuroscience perspectives on the brain basis of emotional experience. Neurosci Biobehav Rev 2017; 76:187-215. [DOI: 10.1016/j.neubiorev.2016.09.010] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 07/22/2016] [Accepted: 09/14/2016] [Indexed: 12/30/2022]
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LaFollette MR, O’Haire ME, Cloutier S, Blankenberger WB, Gaskill BN. Rat tickling: A systematic review of applications, outcomes, and moderators. PLoS One 2017; 12:e0175320. [PMID: 28384364 PMCID: PMC5383284 DOI: 10.1371/journal.pone.0175320] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Accepted: 03/23/2017] [Indexed: 01/28/2023] Open
Abstract
Introduction Rats initially fear humans which can increase stress and impact study results. Additionally, studying positive affective states in rats has proved challenging. Rat tickling is a promising habituation technique that can also be used to model and measure positive affect. However, current studies use a variety of methods to achieve differential results. Our objective was to systematically identify, summarize, and evaluate the research on tickling in rats to provide direction for future investigation. Our specific aims were to summarize current methods used in tickling experiments, outcomes from tickling, and moderating factors. Methods We systematically evaluated all articles about tickling identified from PubMed, Scopus, Web of Science, and PsychInfo. Our inclusion criteria were publication in a peer-reviewed journal and collection of original, empirical data on rats using the handling method of tickling. One researcher extracted information from each article. Bias was assessed by 2 investigators using the SYRCLE bias assessment tool. Results We identified 32 articles (56 experiments) published in peer-reviewed journals about rat tickling for inclusion. A wide variety of strains, sexes, and ages of rats were included. The most common method used for tickling was cycling through 15 seconds of tickling and 15 seconds of rest for 2 minutes for 3 to 5 days. Experiments with a control for tickling (N = 22) showed that tickling increases positive vocalization, approach behavior, decreases anxiety measures, improves handling, and in some cases decreases stress hormones. Tickling juvenile, individually housed rats with a trait predisposition to respond more positively to tickling, results in the most positive outcomes. Methods to reduce bias were insufficiently reported. Conclusions We conclude that tickling is a promising method for improving rat welfare and investigating positive affect. However, the establishment of tickling best practices is essential as the outcomes from tickling can be moderated by several factors.
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Affiliation(s)
- Megan R. LaFollette
- Department of Animal Sciences, Center for Animal Welfare Science, College of Agriculture, Purdue University, West Lafayette, Indiana, United States of America
- * E-mail:
| | - Marguerite E. O’Haire
- Department of Comparative Pathobiology, Center for the Human-Animal Bond, College of Veterinary Medicine, Purdue University, West Lafayette, Indiana, United States of America
| | - Sylvie Cloutier
- Canadian Council on Animal Care, Assessment and Accreditation Section, Ottawa, ON, Canada
| | - Whitney B. Blankenberger
- Department of Comparative Medicine, Stanford University, Stanford, California, United States of America
| | - Brianna N. Gaskill
- Department of Animal Sciences, Center for Animal Welfare Science, College of Agriculture, Purdue University, West Lafayette, Indiana, United States of America
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